feat: translation documentation

docs/TRANSLATION.md

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+# Translating TizenBrew
+
+If you'd like to help translate TizenBrew into your language, you can do so by following these steps:
+
+## Fork the Repository
+
+First, fork the [TizenBrew repository](https://github.com/reisxd/TizenBrew) on GitHub.
+
+## Copy the English Translation File
+
+Copy the `en.json` file from the `lang` directory and rename it to the appropriate language and country code. For example, if you're translating TizenBrew into French, you would rename the file to `fr_FR.json`. See ISO 639-2 and ISO 3166-1 alpha-2 for a list of language and country codes.
+
+## Translate the File
+
+Translate the contents of the file into your language. Do not translate the text between the curly braces (`{}`).
+
+## Add Your Language to the Languages List
+
+Add your language to the `languages` object in [here](https://github.com/reisxd/TizenBrew/blob/main/tizenbrew-app/TizenBrew/js/translation.js#L6) following the same format as the other languages (`English Name (Native Name)`).
+
+## Submit a Pull Request
+
+Once you've finished translating the file, submit a pull request to the main TizenBrew repository.
+
+
+## Done!
+
+That's it! Your translation will be reviewed and merged into the main TizenBrew repository. Thank you for your help!